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对北京市郊三种种植方式的水稻土、潮土、潮褐土的农（菜）田进行全年观测。结果表明，菜田含水量较普通大田要高且较稳定，耕灌对土壤的影响主要集中在１４０ｃｍ深度以上，土壤含水量由地表至下层呈梯度升高，因地下水同上层土壤水相联通，可能导致淋洗；地下水位高（０．６～３．０ｍ）的菜田地下水浓度可达４５～６０ｍｇ／ｋｇ，地下水位７～１０ｍ的菜田已季节性地淋洗到１６０～１８０ｃｍ深度；在整个土壤剖面中的周年含量相对稳定。
The perennial observation of paddy soil, alluvial soil and moist cinnamon soil in the suburbs of Beijing was conducted. The results showed that the water content in vegetable field was higher and stable than that in common field. The impact of tillage irrigation on soil was mainly above 140cm depth. The soil water content increased from the ground surface to the lower layer. Because of the connection between groundwater and upper soil water, The groundwater concentration of vegetable field with high groundwater table (0.6 ~ 3.0m) can reach 45 ~ 60mg / kg, and the vegetable field with groundwater table of 7 ~ 10m has been rinsed seasonally to the depth of 160 ~ 180cm; Annular content throughout the soil profile is relatively stable.